I will run the way of thy commandments, ... enlarge my heart

I will run the way of thy commandments. With energy, promptitude, and zeal he would perform the will of God, but he needed more life and liberty from the hand of God. When thou shalt enlarge my heart. Yes, the heart is the master; the feet soon run when the heart is free and energetic. Let the affections be aroused and eagerly set on divine things, and our actions will be full of force, swiftness, and delight. God must work in us first, and then we shall will and do according to his good pleasure.